1 ;;;; FIXME: This file and host-c-call.lisp are separate from the
2 ;;;; rest of the alien source code for historical reasons: CMU CL
3 ;;;; made a distinction between the stuff in the C-CALL package and
4 ;;;; stuff in the ALIEN package. There's no obvious boundary
5 ;;;; there, though, and SBCL doesn't try to make this distinction,
6 ;;;; so it might make sense to just merge these files in with the
7 ;;;; rest of the SB-ALIEN code.
9 ;;;; This software is part of the SBCL system. See the README file for
10 ;;;; more information.
12 ;;;; This software is derived from the CMU CL system, which was
13 ;;;; written at Carnegie Mellon University and released into the
14 ;;;; public domain. The software is in the public domain and is
15 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
16 ;;;; files for more information.
18 (in-package "SB!ALIEN")
22 (define-alien-type char (integer 8))
23 (define-alien-type short (integer 16))
24 (define-alien-type int (integer 32))
26 (define-alien-type long (integer #.sb!vm::n-machine-word-bits))
28 (define-alien-type long (integer 32))
30 (define-alien-type long-long (integer 64))
32 (define-alien-type unsigned-char (unsigned 8))
33 (define-alien-type unsigned-short (unsigned 16))
34 (define-alien-type unsigned-int (unsigned 32))
36 (define-alien-type unsigned-long (unsigned #.sb!vm::n-machine-word-bits))
38 (define-alien-type unsigned-long (unsigned 32))
39 (define-alien-type unsigned-long-long (unsigned 64))
41 (define-alien-type float single-float)
42 (define-alien-type double double-float)
44 (define-alien-type utf8-string (c-string :external-format :utf8))
46 (define-alien-type-translator void ()
47 (parse-alien-type '(values) (sb!kernel:make-null-lexenv)))
50 (defun default-c-string-external-format ()
54 (or *default-c-string-external-format*
55 (setf *default-c-string-external-format*
56 (sb!impl::default-external-format))))
58 ;;; FIXME: %NATURALIZE-C-STRING (and the UTF8 siblings below) would
59 ;;; appear to be vulnerable to the lisp string moving from underneath
60 ;;; them if the world undergoes a GC, possibly triggered by another
63 ;;; Actually the above shouldn't happen; x86 and x86-64 use GENCGC,
64 ;;; so the string can't move by virtue of pointers to it from
65 ;;; outside the heap. Other platforms will access the lisp string
66 ;;; through the GC-safe interior pointer. -- JES, 2006-01-13
67 (defun %naturalize-c-string (sap)
68 (declare (type system-area-pointer sap))
70 (declare (optimize (speed 3) (safety 0)))
71 (let ((length (loop for offset of-type fixnum upfrom 0
72 until (zerop (sap-ref-8 sap offset))
73 finally (return offset))))
74 (let ((result (make-string length :element-type 'base-char)))
75 (sb!kernel:copy-ub8-from-system-area sap 0 result 0 length)
78 (defun string-to-c-string (string external-format)
79 (declare (type simple-string string))
81 (declare (optimize (speed 3) (safety 0)))
82 (let ((external-format (sb!impl::get-external-format-or-lose external-format)))
83 (funcall (sb!impl::ef-write-c-string-fun external-format) string))))
85 (defun c-string-to-string (sap external-format element-type)
86 (declare (type system-area-pointer sap))
88 (declare (optimize (speed 3) (safety 0)))
89 (let ((external-format (sb!impl::get-external-format-or-lose external-format)))
90 (funcall (sb!impl::ef-read-c-string-fun external-format) sap element-type))))